Enhanced transport properties in La{sub x}MnO{sub 3-{delta}} thin films epitaxially grown on SrTiO{sub 3} substrates: The profound impact of the oxygen content
- CNR-INFM Coherentia and Department of Mathematics and Informatics, University of Salerno, I-84081 Baronissi (Italy)
- CNR-INFM Coherentia and Department of Physics, University of Napoli, I-80125 Napoli (Italy)
- CNR-INFM National Laboratory TASC, I-34012 Basovizza (Italy)
- Department of Physics and CNR-INFM Coherentia, University of Salerno, I-84081 Baronissi (Italy)
We report on structural, magnetic, and transport properties of La{sub x}MnO{sub 3-{delta}} (LMO) thin films, epitaxially grown on SrTiO{sub 3} substrates by molecular beam epitaxy. Transport properties were investigated as a function of the La/Mn stoichiometry and the oxygen content. Optimal oxygenated LMO films (with stoichiometry ratio La/Mn=0.88) show a metal-insulator transitions temperature T{sub MI}{approx}387 K and magnetotransport similar to those found in strontium-doped La{sub 1-x}Sr{sub x}MnO{sub 3} manganites compounds. Also in presence of a La/Mn slight unbalance (namely, x=0.98), LMO films show a very high T{sub MI}{approx}370 K. However, LMO samples with La/Mn ratio larger than one, show severely depressed conducting properties, being insulating for x>1.10. All these findings clearly demonstrate that the lanthanum deficiency is a very efficient way to dope manganites, as in the case of bivalent cation-substitution.
- OSTI ID:
- 21294185
- Journal Information:
- Applied Physics Letters, Vol. 95, Issue 1; Other Information: DOI: 10.1063/1.3168649; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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